i know it seems really really easy but for some reason i can't get it... :-/ help
write an equation for the specified line...
... for the vertical line through (0,-3)
thanks!
2007-09-12 12:28:07 · 5 answers · asked by Katie 4 in Science & Mathematics ➔ Mathematics
A vertical line would go straight up and down and since (0, -3) is on the y-axis, then the line is the y-axis (or x = 0)
2007-09-12 12:33:59 · answer #1 · answered by sfroggy5 6 · 1⤊ 0⤋
Vertical lines have an undefined slope. They are always written in the form x = n, where n is some integer. Since your line goes through the point (0, -3) which is on the y-axis 3 units down, a vertical line would be totally on the y-axis. Quickest way to do this is to state that since your point has an x-coordinate of 0, on a vertical line x must always have that value of 0. This makes the equation of your line x = 0.
FYI, horizontal lines work the same way but for values of y. If you wanted the horizontal line through (4, -3), we'd know that every point on the line must have a y-value of -3. This would make the equation y = -3.
2007-09-12 12:38:30 · answer #2 · answered by cubs_woo_cubs_woo 3 · 0⤊ 0⤋
Vertical line thru y =-3 is the y axis. That's x=0
2007-09-12 12:34:50 · answer #3 · answered by Anonymous · 0⤊ 0⤋
All the points on a vertical line have the same x-coordinate but different y-coordinates. Your point's x-coordinate is 0, so your equation is x = 0, which of course is the y-axis.
2007-09-12 12:34:17 · answer #4 · answered by Philo 7 · 0⤊ 0⤋
a vertical line's equation is
x= some number
your x is 0 so your vertical line is drawn directly over the y axis where x=0
2007-09-12 12:38:12 · answer #5 · answered by Anonymous · 0⤊ 0⤋